*Excludes Observations that spanned multiple years

Pre 19709
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19802
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19931
19940
19950
19960
19970
19980
19990
20000
20011
20020
20030
20040
20050
20060
20071
20081
20092
20100
20110
20120
20130
20140
20150
20160
20170
20180
20190
20201
20211
20220
20230
20240
Total20