*Excludes Observations that spanned multiple years

Pre 19707
19700
19710
19720
19730
19740
19753
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19867
19872
19883
19894
199010
19917
19921
19933
19943
19950
19961
19970
19980
19998
200012
20010
20021
20030
20040
20050
20061
20070
200818
20096
20102
20111
20123
201321
20140
20151
20162
20170
20180
20190
20200
20211
20220
Total128