1993

6.5

1971

7.2

2008

4.1

2000

4.3

2006

4.2

2004

5.3

2006

6.4

1999

7.1

1987

6.8

1984

7.1

1996

5.4

2016

7.3

1994

4.9

1986

6.3

1993

6.6

1996

5.5

2003

5.6

2007

3.9

2004

6.2

1999

5.8