*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19771
19781
19791
19800
19811
19820
19830
19842
19852
19862
19870
19880
19890
19902
19910
19923
19931
19946
19951
19963
19970
19980
19991
20000
200116
20023
20030
20040
20051
20063
20070
20080
20090
20103
201133
20123
20131
20142
20151
20167
201714
20185
201942
202043
20217
202214
20235
20240
Total230