*Excludes Observations that spanned multiple years

Pre 197013
19700
19710
19720
19730
19740
19751
19761
19771
19781
19792
19800
19811
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19921
19932
19941
19952
19961
19973
19980
19990
20000
20011
20021
20030
20040
20050
20060
20070
20080
20090
20103
20113
20120
20130
20140
20150
20161
20170
20180
20190
20200
20210
20220
Total39