*Excludes Observations that spanned multiple years

Pre 19709
19700
19710
19720
19730
19740
19750
19762
19771
19780
19790
19800
19811
19821
19830
19840
19851
19860
19870
19880
19895
19902
19911
19921
19930
19940
19951
19960
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20083
20090
20100
20110
20120
20130
20140
20150
20160
20170
Total28