1993

5.4

2013

7.6

2003

5.6

1992

8.1

2003

6.5

1989

7.8

2002

7.5

1991

7.5

1998

7.4

1974

7.5

1997

6.7

1988

7.9

1985

5.4

1976

7.3

1995

7.9

1997

8.3

2004

6.3

2019

7.4

2015

7.7

1996

6.8