*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19782
19790
19800
19810
19822
19830
19840
19852
19860
19871
198814
19890
19907
19912
199212
199311
19947
19955
19966
19974
19986
199911
20009
20015
20023
20039
20043
20050
20060
20073
20081
20093
20101
20110
20120
20130
20140
20150
20160
20170
Total130