*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19771
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19911
19920
199315
19941
19956
19962
19977
199814
19993
20007
20012
20026
20030
20040
20050
20060
20072
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
Total69