*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19771
19780
19790
19800
19810
19820
19833
19840
19851
19860
19876
19880
19896
19904
19915
19924
199314
19946
19955
19962
19971
19984
19992
20001
20011
200210
20034
20040
200525
20062
20072
200813
20090
20104
20115
20120
20130
20140
20150
20165
20170
Total136