*Excludes Observations that spanned multiple years

Pre 19701
19701
19711
19720
19730
19740
19750
19761
19772
19780
19791
19800
19810
19820
19831
19840
19851
19861
19879
19880
198919
19905
199110
199215
199322
19948
199535
199641
199753
199828
19999
200013
20014
20029
20036
20047
20057
20067
20076
20083
20090
20100
20110
20121
20130
20140
20150
20162
20171
20180
Total330