*Excludes Observations that spanned multiple years

Pre 19706
19700
19710
19720
19730
19740
19755
19761
19770
19782
19791
19801
19810
19820
19830
19840
19850
19862
19870
19880
19890
19902
19911
19921
19930
19941
19950
19961
19971
19980
19990
20001
20010
20020
20030
20040
20050
20060
20074
20081
20090
20100
20110
20120
20130
20140
20150
20160
20170
20180
20190
20200
Total31