*Excludes Observations that spanned multiple years

Pre 19709
19702
19710
19720
19730
19742
19752
19760
19771
19780
19791
19800
19810
19821
19830
19840
19850
19861
19870
19881
19890
19900
19912
19925
19930
19940
19950
19960
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20080
20091
20102
20112
20120
20130
20140
20150
20160
20170
Total32