*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000108889
1970000044
197100001010
1972001067
1973000088
1974031059
1975000088
197601001213
197730001215
197800101213
197900701623
198000101415
198111301621
198201302125
198310301620
198400302124
198503101721
198611502128
198715702235
198802802333
1989041412039
199004902538
1991066012188
1992343701862
1993255403192
1994835512996
1995646002595
1996332701952
1997902503569
1998193602975
1999253412668
2000263503578
2001073513477
2002005902382
2003043012560
2004142902559
2005452803370
2006135612990
2007233602768
20081174827111
200900156049205
201060174149230
2011121256058327
2012602242118350
2013110165050226
2014101602845
201501803241
201600702835
201702603240
2018001089
2019000279
2020001001
2021000000
Total7811118522013473408