*Excludes Observations that spanned multiple years

Pre 19708
19700
19710
19720
19730
19740
19751
19760
19770
19780
19791
19801
19811
19822
19831
19841
19850
19860
19871
19882
19890
19901
19910
19921
19931
19941
199545
19963
19977
19985
19990
20007
20011
20023
20031
20040
20053
20060
200714
200813
20096
201010
20112
201210
20134
20143
20150
20165
20171
20180
20195
20200
20216
20221
20236
20240
Total184