*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19952
19962
19972
19980
19990
20009
20015
200222
20037
20045
200513
20061
20070
20082
20092
20100
20110
20120
20131
20140
20158
201620
201723
20181
Total125