*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
19901
19910
19925
19930
19940
19950
19960
19970
19981
19990
20001
20010
20020
20033
20040
20050
20060
20070
20080
20091
20100
20112
20123
20133
20140
20150
20160
20170
20180
20191
20202
20211
20220
20230
20240
Total24