*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
199027
199135
199250
199345
199413
19951
199623
19975
19980
19994
20000
20010
200210
20031
20040
20051
20061
20070
200827
200916
20102
201110
20120
20131
20140
20152
20164
20170
20180
20190
20200
Total281