*Excludes Observations that spanned multiple years

Pre 197020
19700
19710
19720
19730
19743
19750
19761
19770
19782
19790
19800
19810
19820
19830
19840
19850
19861
19871
19880
19890
19900
19910
19920
19930
19940
19952
19963
19970
19980
19993
20000
20010
20020
20030
20040
20050
20060
20078
20088
20094
20103
20110
20120
20132
20140
20150
20160
20172
20180
Total63