*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19932
19940
19951
19960
19972
19980
19990
20000
20011
20020
20030
20040
20050
20061
20071
20082
20092
201014
201110
20121
20131
20142
20151
20167
20170
20180
Total49