*Excludes Observations that spanned multiple years

Pre 19709
19700
19711
19721
19730
19740
19750
19766
19771
19781
19790
19800
19810
19820
19830
19840
19856
19864
19870
19882
19893
19901
19910
19920
19931
19940
19951
19960
19971
19980
19991
20002
20010
20020
20030
20040
20050
20060
20071
20080
20090
20101
20111
20120
20130
20140
20151
20160
20170
20180
Total45