*Excludes Observations that spanned multiple years

Pre 19708
19701
19712
19720
19731
19741
19750
197614
197718
19784
19791
19803
198124
19822
19830
19842
19854
19864
19872
19887
19895
19903
1991117
1992102
1993120
199426
199522
199661
199790
199811
199969
200024
2001117
200211
200362
200460
200526
200652
20073
20088
200918
201072
2011135
201244
2013145
2014212
2015205
2016295
2017338
2018296
2019280
2020202
20211
20220
Total3330