*Excludes Observations that spanned multiple years

Pre 19703
19701
19714
19720
19730
19740
19750
19760
19775
19781
19791
19802
19811
19820
19832
19841
19854
198624
198752
1988119
19893
199016
1991184
1992204
199370
199417
1995109
199639
199730
199823
1999100
200096
2001127
200281
200332
200492
20052
200624
20073
200837
200933
201032
201120
20124
20139
20143
20150
20167
201716
201814
201931
20201
20210
20220
Total1679