*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19751
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19933
19940
19951
19960
19970
19980
19991
20001
20010
20020
20030
20040
20050
20060
20070
20080
20090
20101
20114
20121
20130
20140
20154
20164
20171
201814
20191
20203
20213
20222
20236
20240
Total53