*Excludes Observations that spanned multiple years

Pre 19704
19700
19710
19720
19731
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19844
19851
19861
19878
19881
19891
199014
199110
19926
19930
199411
199523
199662
19978
199813
19996
20000
20014
20021
20031
20041
20053
20060
20070
20084
20095
20101
20111
20122
20130
20142
20151
20160
20170
20186
20190
20201
20210
20220
Total208