*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19731
19740
19752
19760
19770
19781
19790
19800
19811
19820
19832
19840
19855
19862
19876
19881
19890
19903
19910
19921
19931
199411
199511
19967
199711
19989
19993
20003
200114
20020
200313
200436
200538
200668
200760
200854
200940
201080
2011303
201224
201364
201465
201520
2016100
201737
201871
201922
202013
202162
202270
202378
20246
Total1420