1999

5.7

1985

6.2

1969

6.5

2008

6.0

1993

6.0

2015

7.0

2021

6.5

2007

6.1

1986

6.7

2004

6.3

2006

7.5

1995

6.2

2007

6.2

2005

5.9

2005

5.6

1991

5.3

2000

6.8

1987

7.3

2007

5.8

2006

5.9