*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19735
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19871
19880
19890
19900
19910
19921
19930
19941
19950
19966
19971
19982
19993
20004
20013
20022
20036
20042
20050
20060
20070
200831
200932
201072
2011189
2012227
2013115
2014359
20151453
20161268
2017154
201814
20190
20204
20210
20220
20230
20240
Total3956