*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19821
19830
19840
19850
19861
19871
19880
19893
19902
19914
19924
19933
19941
19953
19960
19975
19982
19994
20001
20013
20020
20033
20041
20051
20062
20070
20084
20092
20107
201110
20128
20135
201415
20157
201616
20179
20188
20199
20205
20218
20228
20235
20244
Total176