*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19700060166172
1970004048
197100001010
1972001078
1973001089
19740030710
19750130913
197600301417
197701701523
197800901423
1979101701937
198000401923
198100601925
1982001002232
198300402125
198400402327
198501302226
1986021102336
1987021702645
1988031202136
1989061802246
1990131912062
19912302802282
19922142812166
199324734028111
1994310059029191
199585525128117
199698347121161
1997217546131255
1998720442125279
1999514828123205
2000820442037291
2001725443137342
2002223178128340
2003334282225454
2004331874129425
20053173213041430
20065252234038529
20073221225760516
20084783062346457
2009799409054569
20101457483065619
201179810199926
201203744115207700
2013241410954516
2014134201114251
2015125135113175
2016006001373
20171150310
Total113327947406916029803