*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19933
19941
19951
19968
19971
19981
19991
20000
20010
20020
20031353
2004112
2005344
200687
2007310
200849
2009620
201015
20119
20124
20132
201430
201565
2016137
2017165
201845
Total3363