*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19721
19730
19740
19750
19760
19770
19780
19792
19800
19810
19820
19831
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19978
199811
19990
20003
20011
20020
20030
20040
20052
20060
20070
20080
20090
201018
201176
201277
201329
201410
201529
20161
20170
20180
Total271