*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19763
19772
19780
19790
19800
19811
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19921
19932
19945
199521
19969
199718
199824
19998
20001
20013
20021
20034
20046
200513
20062
20079
20085
20097
20100
20110
20120
20130
20140
20150
20160
20170
Total145