*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19862
19871
19880
19890
19900
19913
19920
19931
19940
19957
19961
19970
19980
19990
20001
20011
20023
20030
20040
20050
20061
20070
20080
20090
20101
20113
20120
20133
20140
20150
20168
20179
20180
20190
20201
20211
20220
20233
20241
Total52