*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19863
19876
19881
19891
19904
19913
19926
199316
19942
199517
19964
19972
19987
19991
20000
20010
20027
20030
20040
20056
20061
20070
200815
20091
20100
20110
20120
20130
20141
20150
20160
20170
Total105