*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197050004054
1970300418
19716005011
1972600208
1973400509
1974300306
19755008013
1976100018129
197790019129
197810006016
197913002015
1980110020031
198112009021
198215017023
1983120012024
1984170011028
1985130010124
198611007018
1987130018536
1988171010634
1989111031025
199013119933
199172311831
1992100311630
199380110625
1994150412940
1995120814236
19961609181255
19971503211049
19981402361163
1999160230755
2000160123646
2001120521442
200290031040
2003101129142
2004190429254
2005170030148
2006190252073
2007202356182
20082372672101
2009100358374
2010100184499
2011141078497
2012260033261
201350013119
2014000538
20152017313
2016300205
2017000101
2018000000
Total59216609741421784