*Excludes Observations that spanned multiple years

Pre 19701
19700
19715
19729
19733
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19863
198711
198814
198941
19905
199112
19929
19932
199438
199518
19961
19977
19981
199916
20000
20019
20025
20032
200411
200520
20062
20076
20085
20091
20106
201110
20125
20136
20144
20155
20164
20174
20180
20192
20200
Total304