*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19903
19910
19925
19933
19940
19952
19961
19970
19982
19991
20009
20012
20020
20033
20041
20052
20060
20070
20081
20093
20100
20110
20125
20130
20140
20150
20160
20170
Total43