*Excludes Observations that spanned multiple years

Pre 19704
19700
19710
197210
197312
19740
19750
19760
197713
19780
19791
19800
19810
19820
19830
19842
19850
198611
19870
19880
19893
19901
199112
19921
19933
199415
19951
19960
19970
19980
19990
20000
20010
20020
20031
20040
20051
20060
20071
20080
20090
20101
20111
20120
20130
20140
20150
20160
20170
20180
Total94