*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19701550020157
1970400105
197110000010
1972700108
1973800109
1974700209
19759002112
197614003017
197716004020
197814003017
197919006025
198017008126
198119006025
198222004026
198321002023
198420002022
198519003123
1986260012139
1987270023555
1988230013339
1989260025455
1990221173364
19912217231366
199222231269108
1993273726133196
1994300540229304
1995294826207274
1996231435290353
1997361219281339
1998291831326395
1999251518103152
2000371641411496
2001482640248344
2002451275457580
2003282351426510
2004280237450517
2005402170195308
20063723146271459
20073851136366546
20083891174265487
20093805220145408
20105013331278663
20118110469112663
201211971186223536
20131430254228499
201412176313393
201540078486
201630030336
2017000415
2018000000
Total139753852778609610409