1993

7.5

1996

6.4

1999

5.4

2004

7.5

2010

4.8

2014

6.1

2007

5.3

1999

0.0

1995

4.0

2012

5.0

1959

8.1

1989

5.8

2000

5.8

1995

6.5

1999

5.7

1969

7.0

2003

7.4

1990

6.0

1988

6.3

2000

6.5