*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19741
19754
19761
19770
19780
19791
19800
19810
19820
19830
19840
19853
19861
19870
19880
19890
19900
19910
19921
19934
19946
19950
19960
19970
19980
19993
20000
20010
20020
20030
20040
20050
20061
20070
20080
20090
20100
20112
20120
20130
20140
20150
20162
20173
20182
20191
20203
20210
20222
20230
20240
Total41