*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19740
19750
19760
19770
19781
19791
19800
19811
19820
19830
19841
19850
19860
19870
19880
19890
19900
19910
19926
19932
19940
19951
19960
199711
19980
19990
20000
200112
20020
20031
20040
20050
20061
20070
20081
20090
20100
20112
20120
20132
20144
20153
20160
20171
20189
201970
20201
20210
20220
20235
20240
Total137