我需要计算具有此表的年平均索赔成本（由Loss_ID标识）
LOSS_ID DATE_OF_LOSS PAID
9338915 07/04/16 32407,8705
11090192 05/03/16 538,5223116
11141663 27/12/15 24391,16819
11194916 19/12/15 18696,16086
12021280 20/11/15 226332,6824
12200329 27/07/15 570,2798236
12803527 06/07/15 290431,0683
13161530 05/05/15 26300,71844
13273193 28/10/14 309157,5554
13290764 23/10/14 9750,473454
15021924 06/10/14 858913,8386
that I transformed to this
lossYear V2
1: 2016 32407.8705
2: 2016 538.5223
3: 2015 24391.1682
4: 2015 18696.1609
5: 2015 226332.6824
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104: 2000 937630.6532
105: 2000 862384.5857
106: 2000 826491.8463
107: 2000 2557670.2650
108: 1999 778954.6528
我不仅应该计算每年的索赔总额，而且还要将每笔索赔的总数除以得出平均费用