*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
199316
199414
199514
19963
199714
19980
19990
20000
20010
20026
20035
20041
20052
20060
20070
20080
20090
20100
20111
20121
20132
20140
20150
20161
20170
20180
20190
20201
20210
20220
20230
Total81