*Excludes Observations that spanned multiple years

Pre 197022
19701
19712
19720
19730
19741
19751
19760
19770
19781
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19901
19910
19921
19931
19940
19951
19962
19970
19980
19990
20000
20010
20021
20030
20041
20050
20060
20071
20085
20091
20100
20110
20120
20130
20140
20150
20160
20170
Total43