*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19761
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19905
19911
19925
19939
199412
19950
19960
19974
19982
19990
20002
200116
20020
20030
200417
20051
20060
20071
20085
20091
20100
20110
20120
20132
20141
20150
20160
20170
Total86