*Excludes Observations that spanned multiple years

Pre 19709
19700
19710
19721
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19891
19900
19911
19920
19931
19940
19950
19960
19971
19981
19994
20003
20010
20027
20034
20040
20050
20061
20073
20082
20091
20101
20111
20120
20133
20140
20151
20160
20174
20180
20190
20200
20210
20220
20230
20240
Total50