*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19862
19870
19880
19890
19900
19910
19924
19931
19944
19951
19960
19970
19980
19990
20000
20012
20020
20030
200430
20050
20063
20070
20081
20091
20100
20110
20121
20132
20142
20150
20160
20170
Total56