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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
19841
19850
19860
19870
19880
19890
19900
19910
19922
19935
19940
19950
19960
19970
19982
19990
20000
20011
20020
20030
20040
20050
20061
20070
20081
20090
20100
20112
20121
20131
20140
20150
20160
20172
20187
20194
20209
20213
20223
20230
20240
Total46