*Excludes Observations that spanned multiple years

Pre 197010
19700
19711
19724
19734
19740
19752
19760
19772
19781
19790
19801
19811
19820
19830
19843
19851
19860
19870
19880
19891
19900
19911
19920
19933
19940
19950
19961
19970
19980
19990
20001
20010
20020
20030
20040
20052
20061
20072
20081
20090
20100
20110
20120
20130
20141
20150
20160
20170
20180
20190
20200
20210
Total44