*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19771
19781
19791
19800
19810
19820
19831
19841
19851
19861
19870
19880
19890
19900
19911
19920
19930
19940
19950
19960
19970
19981
19990
20000
20011
20020
20030
20040
20050
20060
20071
20080
20093
20104
20110
20120
20130
20140
20150
20161
20170
20180
20190
20201
20211
20220
20230
20240
Total21