*Excludes Observations that spanned multiple years

Pre 1970210
19701
19712
19722
19737
19742
19752
19761
197761
19782
19792
19801
19811
19821
19836
19843
1985369
1986842
19874
19881
198947
1990154
199113
19923
199313
199483
199570
1996749
1997107
1998253
1999835
2000386
2001909
2002819
20032694
20042135
2005922
20061373
20072230
20081452
20093293
20104499
20112738
20122020
20134261
20142371
20152879
20161440
20171483
20182209
2019736
202034
20210
Total44730