*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19740
19750
19760
19771
19780
19790
19800
19810
19821
19831
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19970
19980
19990
20000
20011
20020
20030
20040
20051
20060
20070
20080
20090
2010111
2011150
2012509
201349
2014405
2015439
2016535
2017325
20183
Total2532