diff --git a/src/app/app.component.html b/src/app/app.component.html
index 1ca7739..0899ed9 100644
--- a/src/app/app.component.html
+++ b/src/app/app.component.html
@@ -1,4 +1,7 @@
 <main class="main">
+  <div class="container">
+    {{testDate}}
+  </div>
   <div class="row row-cols-auto">
     <div class="col">
       <div ngbDropdown class="d-inline-block" #houseDrop="ngbDropdown">
diff --git a/src/app/app.component.ts b/src/app/app.component.ts
index 3d3f09d..a3a2238 100644
--- a/src/app/app.component.ts
+++ b/src/app/app.component.ts
@@ -5,7 +5,10 @@ import { ChartComponent } from './chart/chart.component';
 import { RestService } from './rest.service';
 import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
 import { NgbDropdownModule } from '@ng-bootstrap/ng-bootstrap';
-import { endOfMonth, format, startOfMonth, subMonths } from 'date-fns';
+import { addMonths, endOfMonth, format, startOfMonth, subMonths, subYears } from 'date-fns';
+import { Statistics } from './statistics';
+import { firstValueFrom } from 'rxjs';
+import { formatNumber } from '@angular/common';
 
 @Component({
   selector: 'app-root',
@@ -19,11 +22,17 @@ export class AppComponent implements OnInit, OnChanges {
   constructor(private rest: RestService) {
   }
   ngOnChanges(changes: SimpleChanges): void {
+    this.testFunction().then((result: string) => {
+      this.testDate = result;
+    });
   }
   
   ngOnInit(): void {
     this.houseId = 1;
     this.duration = 120;
+    this.testFunction().then((result: string) => {
+      this.testDate = result;
+    });
   }
 
   getHouseName(): string {
@@ -50,20 +59,28 @@ export class AppComponent implements OnInit, OnChanges {
     }
   }
   
-  testFunction(): string {
-    let startThisMonth: Date = subMonths(startOfMonth(new Date()), 1);
+  async testFunction(): Promise<string> {
+    let startThisMonth: Date = subYears(startOfMonth(new Date()), 1);
     let returnValue: string = '';
     for (let i = 0; i < 12; i++) {
-      let endThisMonth: Date = endOfMonth(startThisMonth);
+      let endThisMonth: Date = addMonths(startThisMonth, 1);
+
+      // REST-Service aufrufen.
+      let stats: Statistics = await firstValueFrom(this.rest.getStatsFromTimeframe(this.houseId, startThisMonth, endThisMonth))
+      
       returnValue += ' / ' + format(startThisMonth, 'dd.MM.yyyy HH:mm:ss')
         + ' - ' + format(endThisMonth, 'dd.MM.yyyy HH:mm:ss')
-        + ' (' + startThisMonth.getTime() + ' - ' + endThisMonth.getTime() + ')<br>';
-      startThisMonth = subMonths(startThisMonth, 1);
+        + ' (' + startThisMonth.getTime() + ' - ' + endThisMonth.getTime() + '): '
+        + stats.producedEnergy + ' #### '
+        ;
+      console.log(format(startThisMonth, 'MMM yyyy')
+      + ': ' +  formatNumber(stats.producedEnergy/1000000, 'de-DE', '1.2-2') + 'kWh' );
+      startThisMonth = addMonths(startThisMonth, 1);
     }
     return returnValue;
   }
 
-  houseId: number | undefined = undefined;
+  houseId: number = 1;
   duration: number | undefined = undefined;
 
   startThisMonth: Date = startOfMonth(new Date());
diff --git a/src/app/rest.service.ts b/src/app/rest.service.ts
index ddccf35..a9fcc9f 100644
--- a/src/app/rest.service.ts
+++ b/src/app/rest.service.ts
@@ -17,14 +17,38 @@ export class RestService {
   }
 
   getLatestData(houseId: Number, duration: Number): Observable<Aggregate[]> {
-    return this.http.get<Aggregate[]>('https://vz.home.peper.info/rest-vz/latest-data?houseId=' + houseId + '&timeWindow=' + duration);
+    return this.http.get<Aggregate[]>('https://vz.home.peper.info/rest-vz/latest-data', {
+      params: {
+        houseId: houseId + '',
+        timeWindow: duration + '',
+      }
+    });
+  }
+
+  getStatsFromTimeframe(houseId: number, start: Date, end: Date) : Observable<Statistics> {
+    return this.http.get<Statistics>('https://vz.home.peper.info/rest-vz/stats', {
+      params: {
+        houseId: houseId + '',
+        timestampStart: start.getTime() + '',
+        timestampEnd: end.getTime() + '',
+      }
+    });
   }
 
   getStatisticsWithDuration(duration: string | undefined, houseId: Number): Observable<Statistics> {
     if (duration) {
-      return this.http.get<Statistics>('https://vz.home.peper.info/rest-vz/stats?houseId=' + houseId + '&duration=' + duration);
+      return this.http.get<Statistics>('https://vz.home.peper.info/rest-vz/stats', {
+        params: {
+          houseId: houseId + '',
+          duration: duration,
+        }
+      });
     } else {
-      return this.http.get<Statistics>('https://vz.home.peper.info/rest-vz/stats?houseId=' + houseId);
+      return this.http.get<Statistics>('https://vz.home.peper.info/rest-vz/stats', {
+        params: {
+          houseId: houseId + '',
+        }
+      });
     }
   }