*Excludes Observations that spanned multiple years

Pre 19700
19701
19710
19720
19730
19740
19750
19760
19771
19781
19790
19800
19810
19820
19830
19841
19850
19860
19879
19886
19892
19901
19915
19928
19931
19945
19955
19962
199714
199811
19998
20005
20010
20021
20035
20045
20050
20060
20071
20080
20091
20109
201110
20120
20131
20140
20150
20160
20170
Total119