*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19802
19810
19820
19830
19841
19850
19863
19870
19881
19890
19900
19910
19928
19930
19940
19950
19960
199715
19981
19990
20000
20010
200210
20030
200415
20050
20060
20070
20080
20091
20100
20113
20121
20131
20140
20151
20160
20171
Total67