*Excludes Observations that spanned multiple years

Pre 197010
19701
19710
19720
19730
19740
19751
19760
19770
19781
19790
19800
19810
19821
19830
19840
19850
19860
19870
19880
19890
19901
19913
19920
19930
19940
19950
19960
19970
19980
19990
20001
20015
20020
20030
20040
20050
20060
20071
20083
20091
20100
20110
20121
20131
20140
20150
20160
20173
20180
20190
Total34