Era
1987
51
1988
47
1990
46
1981
44
1985
44
1986
43
1984
42
1983
40
1989
40
1980
38
1982
37
2001
35
1993
33
1991
29
1978
25
1998
20
1992
18
1997
18
1974
17
20e siècle
17
1979
16
1999
16
20th century
16
1995
15
1977
14
1994
14
1996
14
2000
13
1971
12
1975
12
1976
12
2002
12
1973
11
1900-1999
10
1972
9
19th century
7
1945-
6
19e siècle
5
2003
5
Since 1945
5
1879-1955
4
1969
4
Geschichte
4
Precambrian
4
Précambrien
4
(1879-1955)
3
1961
3
1971-1981
3
1990-
3
Paleozoic
3
more ...