*Excludes Observations that spanned multiple years

Pre 19704
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19881
19890
19902
19913
19920
19932
199412
19955
19965
19971
19980
19992
20000
20011
20020
20030
20040
20050
20060
20070
20084
200913
201012
20116
20123
20136
20147
20154
20163
20170
20180
20190
20200
20210
20220
Total97