*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19761
19770
19780
19790
19800
19810
19821
19830
19842
19851
19862
19878
19888
198911
199018
199136
199231
199338
199411
199536
19965
199735
199810
19998
20005
200115
20028
20035
200435
200524
20064
20076
20085
20093
201013
201111
20120
20130
20140
20150
20167
20171
20180
Total405