2007

5.3

2006

6.1

1987

7.5

2004

6.3

1990

6.9

2001

7.3

2003

7.1

1970

4.3

2013

4.6

2001

7.9

1998

7.1

1997

8.2

2015

8.2

2002

7.1

2006

7.1

2001

6.5

1997

7.4

1995

7.0

1972

5.5

1997

6.0