*Excludes Observations that spanned multiple years

Pre 19702
19702
19710
19720
19731
19740
19750
19761
19770
19780
19790
19800
19812
19820
19833
198410
198519
1986116
198760
198873
1989372
199065
199180
199234
1993303
199471
199538
1996102
199741
199815
19998
200045
200158
200228
200382
200479
200598
200669
200793
200874
200973
201091
201178
201287
201385
201481
201580
201671
201785
20184
20190
Total2779