1991

7.1

1994

7.4

2014

4.7

2006

6.6

2003

8.2

1999

6.8

1985

7.7

1990

6.5

2003

7.2

2000

5.0

1978

4.8

1982

6.1

1989

6.0

2004

4.6

2008

5.2

2005

6.2

1986

6.7

2014

0.0

1985

7.0

1975

5.2