*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19721
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19855
19861
19871
19881
19893
19900
19910
19920
19933
19944
19958
19966
19972
19980
19992
20001
20012
20020
20038
20044
20053
200611
20077
20086
20094
20105
201110
201211
20137
20142
20155
201611
20174
20189
20194
20201
20216
20223
20233
20241
Total166