*Excludes Observations that spanned multiple years

Pre 197014
19700
19710
19720
19730
19740
19750
19760
19771
19781
19790
19800
19810
19821
19830
19840
19850
19861
19870
19880
19890
19900
19910
19920
19931
19940
19951
19961
19970
19980
19990
20000
20010
20020
20032
20040
20050
20060
20070
20080
20090
20100
20113
20120
20130
20140
20150
20162
20172
20180
20190
20200
20210
20220
20230
20240
Total30