*Excludes Observations that spanned multiple years

Pre 197013
19702
19711
19720
19730
19740
19751
19762
19771
19780
19790
19801
19810
19820
19830
19840
19850
19860
19872
19881
19892
19902
19912
199212
19933
19944
19951
19960
19971
19980
19990
20000
20012
20020
20030
20040
20050
20060
20071
20082
20090
20100
20110
20120
20130
20140
20150
20162
20170
Total58