*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19781
19791
19800
19810
19820
19830
19840
19850
19861
19871
19882
19890
19900
19910
19920
19934
19941
19950
19964
19971
19980
19990
20000
20010
20021
20030
20040
20050
20060
20073
20081
20092
20103
20117
20121
20132
20140
20150
20161
20172
20181
20190
20200
20210
20222
20231
20240
Total44