*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19842
19850
198616
198723
19886
19896
19900
19912
19929
199314
19943
199539
19962
19974
19980
199911
20000
20011
20021
20034
20040
200510
20064
20072
200812
20090
201021
201154
20120
20130
20140
20150
20161
20170
Total248