*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19864
19874
19889
198929
199027
199156
199237
19930
19942
19951
19962
199725
199812
19998
200014
20014
20020
20036
20042
20053
20062
20071
20083
20091
20103
20114
20126
20130
20144
20155
201610
20172
20180
Total286