*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19740
19750
19760
19770
19782
19790
19801
19810
19821
19838
19846
19857
198615
198728
198842
198937
199027
199143
199223
199314
199411
199512
19965
199714
199813
199914
200017
200120
20026
20037
20048
200516
20066
200721
200811
20096
20103
20111
20125
20133
20143
201528
201620
201730
20180
Total535