*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19731
19740
19750
19760
19770
19781
19791
19801
19810
19821
19831
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19951
19961
19970
19980
19990
20000
20010
20020
20031
20040
20050
20062
20072
20082
20095
20100
20111
20120
20130
20140
20150
20160
20170
Total23