1992

7.4

2001

6.9

2004

6.3

1999

7.1

1999

6.8

1984

6.2

1985

7.7

2024

5.5

2006

6.6

2003

7.2

1991

7.1

1994

7.4

1997

6.5

2003

8.3

1987

7.1

2014

5.4

2003

7.2

1980

4.8

1990

6.7

1969

4.6