*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19720
19730
19740
19750
19760
19772
19780
19790
19800
19811
19820
19831
19840
19850
19861
19870
19880
19890
19900
19912
19920
19936
19940
19951
19961
19970
19980
19990
20000
20010
20020
20032
20040
200510
20060
20070
20088
20094
20100
20110
20120
20132
20140
20150
20160
20170
20184
20190
20205
20212
20220
20230
20240
Total53