*Excludes Observations that spanned multiple years

Pre 197023
19700
19710
19720
19730
19740
19750
19760
19771
19781
19790
19800
19811
19820
19830
19840
19850
19861
19870
19880
19890
19900
19911
19920
19930
19940
19950
19960
19970
19980
19990
20000
20010
20020
20033
20040
20050
20061
20074
20082
20090
20100
20110
20125
201313
20140
20150
20160
20171
20180
20190
20200
20219
20220
20230
20240
Total66