*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19855
19863
198713
19885
19896
19902
19910
19921
19932
19940
19950
19960
19970
19980
19993
20003
20012
20020
20030
20040
20050
20060
20072
20081
20090
20100
20110
20121
20132
20140
20152
20161
20171
20180
20190
Total55