*Excludes Observations that spanned multiple years

Pre 19704
19701
19711
19720
19731
19740
19750
19760
19770
19780
19791
19800
19811
19820
19830
19842
19850
19863
19871
19880
19893
19900
199157
199218
199312
19948
199519
199645
199742
19984
19999
20003
200111
20023
20032
20044
20054
20067
20073
20082
20092
201013
201143
20125
201354
201483
201570
201675
201732
201881
201970
202060
202187
202277
20230
20240
Total1023