*Excludes Observations that spanned multiple years

Pre 197077
19701
19711
19720
19731
19743
19753
19763
19774
19781
19793
198018
19812
19826
19837
19840
198589
198696
198759
198832
198945
199066
199117
199238
1993114
199430
1995261
199697
1997577
1998826
1999635
20004549
20011038
2002681
20039338
200412838
20052851
20061637
20071719
20081620
20098274
20101421
20112502
20122520
20131724
20142654
20152665
20162193
20171366
2018302
20190
Total65004