*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19720
19731
19740
19751
19760
19770
19780
19790
19800
19810
19820
19830
19840
198520
19865
198742
1988197
198925
199033
1991103
199255
199393
199431
1995171
199691
199782
19989
199960
200064
200126
200210
20034
20044
20056
20069
20075
200817
200917
20108
201112
201214
201314
201418
201513
201616
201720
20187
20193
20200
20210
20220
Total1307