*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970024006
1970000000
1971000000
1972000000
1973001001
1974010001
1975003003
1976001001
1977002002
1978011002
1979000022
1980011002
1981000000
1982002002
1983000000
198401100011
1985021003
1986011002
198700190120
198801220023
198902280030
199001320015
1991003003
1992052007
199301060117
1994143100155
19950870116
199605750062
19970235601242
19980237600243
19990231300234
20001335601343
20010261900270
200202522600278
200303001800318
20040274600280
200512591800278
200602371501253
200701931900212
200808500058
20091337400108
2010053416500699
201103714000177
201241589800260
2013419412600324
2014927818200469
20151434728100642
2016131122300535
20171243530600753
20181146732800806
20192155437902956
20201608441031053
2021557034500920
2022255717500734
2023006006
2024002002
Total888053358401411739