*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000407680
1970002046
1971001089
1972001067
1973001067
1974003047
19750020810
1976002079
19770050914
19780020911
19790030912
198000301215
1981001089
198200501217
198300301114
198400401317
198501201013
198601901424
198703601524
1988041001630
1989073201352
199014601122
19912141911450
19924142001149
19931552001490
1994155230020603
1995358318217623
1996147023114509
19971283501781
1998135326013393
19990201401448
2000339248121465
2001123837019295
2002142140112475
2003019532013240
2004044125116483
20050303712088
2006022559118303
2007317654021254
200813382022138
2009013276112221
2010495139011249
2011262323044431
201203167124195
201301326008281
201404860393
201503320338
201602470049
201701170220
20180360211
Total3045781879116867184