*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19740
19750
19760
19770
19780
19790
19800
19810
19821
19831
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19970
19980
19990
20000
20011
20020
20030
20040
20051
200618
200713
200875
200938
2010223
2011216
2012544
201363
2014412
2015466
2016385
2017654
201876
2019255
2020100
2021115
202294
202372
202437
Total3861