*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19741
19750
19760
19770
19780
19791
19800
19810
19820
19839
19840
19851
19864
19871
198811
19895
19903
19912
19922
19932
19942
19951
19961
19970
19980
19990
20000
20010
20025
20039
200412
200516
20061
20070
20080
200911
201012
201141
2012218
2013275
2014248
20150
20160
20170
Total895