*Excludes Observations that spanned multiple years

Pre 197010
19700
19710
19720
19730
19740
19750
19761
19770
19780
19790
19803
19812
19821
19830
19840
19850
19863
19870
19880
19890
19904
19910
19922
19930
19941
19950
19960
19971
19980
19990
20000
20010
20023
20030
20041
20052
20062
20070
20081
20090
20100
20110
20120
20132
20140
20151
20160
20171
20180
20190
20200
20211
20220
20232
20240
Total44