调整历年年产值折线图

app/Http/Controllers/CropYieldController.php

@@ -255,6 +255,8 @@ class CropYieldController extends Controller
     {
         $baseId = $request->input('base_id'); //镇
         $nowYear = date('Y');
+        //默认去年开始往前4年；
+        $nowYear--;
 
         $q = CropYield::query();
         if ($baseId) {