*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19870
19883
19891
19900
19910
19923
19932
199412
19958
199613
199713
19981
19998
20003
20010
20021
20032
20043
200521
20060
20070
20083
20090
201015
201126
20122
20133
20141
20150
20160
20170
Total146