*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
19921
19931
19940
19950
19960
19970
19980
19990
20000
20010
20020
20031
20043
20055
20064
20074
20085
20091
20100
20112
20126
20133
20140
20150
20160
20170
20180
20192
20201
20210
20220
20230
20241
Total40