*Excludes Observations that spanned multiple years

Pre 19700
19701
19710
19720
19732
19742
19751
19760
19770
19782
19790
19802
19812
19820
19832
19842
19855
19860
19875
19880
19892
19907
19910
19924
19939
199410
199523
199625
19972
199814
19994
200013
200113
20023
20035
20043
20053
20061
200713
200819
200938
201036
201141
20124
201313
201410
201517
201632
201711
201836
201952
20201
20210
Total490