1985

5.2

1987

7.1

2007

5.3

1992

7.4

2001

6.9

1999

7.1

2003

8.3

1999

6.8

2017

5.3

1991

7.1

1994

7.4

2003

7.2

1990

6.7

1984

6.2

1985

7.8

1982

6.2

2009

6.6

1998

5.2

2005

6.3

1986

6.7