*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19852
19860
19870
19880
19890
19900
19911
19923
19932
19940
19950
19960
19971
19980
19990
20002
20011
20021
20031
20041
20050
20060
20070
20083
20091
201021
201115
20122
20131
20140
20150
20162
20170
20180
20191
20200
20212
20220
20230
20240
Total64