2001

7.1

2006

7.9

1999

8.4

1997

7.1

1999

8.2

2003

7.1

2003

6.7

1971

6.4

1971

8.2

1984

7.7

2002

6.6

2004

6.4

2005

6.7

2004

6.8

1996

5.9

2001

6.5

2002

6.6

2000

5.1

2013

3.9

1927

8.1