*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
198813
19895
19901
19910
19920
19930
19940
19950
19960
19971
19980
19990
20002
20013
20020
20031
20040
20050
20061
20070
20080
20090
20100
20110
20121
20130
20140
20150
20160
20170
20180
20190
20200
20210
20220
Total29