*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19737
19740
19750
19761
19770
19780
19790
19800
19810
19820
19830
19840
19852
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19971
19983
19990
20000
20011
20020
20030
20040
20051
20060
20070
20080
20090
20101
2011298
2012615
201385
201411
20151070
20161421
201713
201814
Total3544