*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19771
19781
19790
19800
19810
19820
19831
19840
19850
19861
19870
19880
19890
19900
19910
19920
19931
19941
19954
19960
19970
19980
19992
20000
200149
20020
20031
20041
20050
20060
20070
20080
20090
20100
20110
20120
20132
20140
20151
201610
20170
20180
20190
Total76