*Excludes Observations that spanned multiple years

Pre 19707
19700
19710
19720
19730
19740
19752
19760
19770
19782
19793
19802
19812
19821
19830
19841
19850
19860
19870
19880
19890
19900
19910
19920
19933
19941
19952
19961
199710
19980
19991
20000
20011
20028
20030
20041
20053
200623
200710
20084
20099
2010919
2011486
2012305
20133395
201448
201597
201617
20176
201837
20193
20200
20212
20220
Total5412