*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19731
19742
19750
19763
19771
19780
19790
19801
19810
19821
19830
19840
19851
19861
19870
19880
19890
19901
19910
19921
19930
19942
19951
19960
19970
19982
19990
20000
20010
20021
20031
20040
20051
20060
20070
20084
20093
20100
20110
20120
20131
20140
20150
20160
20170
Total30