1998

4.4

2006

4.4

2004

6.8

2006

6.2

1992

6.7

2006

7.1

2004

7.3

1996

7.1

2014

6.7

1998

6.3

2002

5.8

1999

7.0

1958

7.6

2003

7.2

2019

6.4

1964

7.2

2007

6.1

2003

6.9

2005

6.7

2000

7.3