*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19851
19860
19870
19880
19890
19900
199126
19923
199310
19942
19950
19962
19970
19981
19998
200010
20010
20021
20031
20041
20050
20061
20071
20083
20090
20100
20112
20120
20133
20140
20150
20162
20170
20180
Total79