*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19840
19850
19860
19870
19880
19891
19901
19911
19920
19930
19942
19950
19960
19971
19982
19993
20000
20011
20020
20037
20044
20051
200658
200731
200847
200946
201057
2011147
2012241
20135
201494
201527
201641
20178
20180
20190
Total827