*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19862
19870
19884
19890
19900
19913
19924
199312
19941
19956
19960
19971
19981
19991
20000
20012
20020
20033
200430
20052
20063
20070
20080
20090
20100
20110
20122
20131
20142
20150
20162
20171
Total84