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*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19853
19863
19870
198838
19890
19900
19914
19920
19938
19940
19952
19960
19971
19980
19990
20000
20010
20020
20030
20040
20050
20063
20070
20087
20090
20102
201113
20120
20131
20140
20150
20160
20172
20183
20191
20203
20215
20221
20230
20240
Total101