*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19781
19791
19800
19810
19820
19830
19840
19850
19861
19870
19881
19890
19901
19912
19920
19930
19942
19951
19961
19970
19980
19990
20000
20012
20020
20030
20040
20050
20062
20070
20080
20090
201023
201121
20120
20132
20146
20153
20167
20176
20183
20191
20200
20210
20220
Total87