*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19862
19870
19882
19890
19900
19911
19920
19938
19941
19951
19961
19971
19980
19994
200012
20014
20023
20030
20041
20051
20061
20071
20080
20091
20100
20110
20120
20130
20142
20150
20162
20172
20186
201912
20209
20219
20229
20232
20240
Total99