*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19813
19820
19830
19840
19851
19863
19873
19882
19891
19904
19911
19921
19932
19941
19951
19960
19976
19988
19992
200017
200111
20028
200344
200459
200552
200676
200729
200838
200944
201061
201150
201235
20131
20143
201515
20161
20170
20180
Total584