*Excludes Observations that spanned multiple years

Pre 19706
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19801
19811
19820
19831
19841
19850
19860
19871
19882
19890
19901
19910
19921
19931
19941
199545
19963
19977
19985
19990
20007
20011
20023
20031
20040
20053
20060
200712
200812
20092
20106
20112
20129
20131
20141
20150
20164
20171
20180
20191
20200
20210
20220
Total144