*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19793
19800
19811
19820
19830
19840
19850
19863
19877
198811
19891
19904
19915
199211
199321
19944
199520
19964
19972
19987
19992
20005
20011
200211
20030
20042
20056
20063
20070
200816
20092
20102
20114
20123
20132
20146
20155
20162
20176
201826
201953
202071
202149
202225
202324
20247
Total437