*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19782
19790
19801
19810
19821
19830
19841
19854
19860
19875
19883
19890
19900
19912
199211
19937
19944
19951
19963
19973
19984
19998
200010
20011
20021
20031
20041
20057
20061
20072
20081
20092
20101
20111
20120
20130
20140
20150
20160
20170
Total89