1997

5.0

2009

6.2

2013

7.1

1994

6.3

2011

5.5

2021

7.0

2019

6.5

2009

6.7

1984

6.0

1990

7.4

2001

7.6

1999

7.9

1997

6.7

2009

4.3

2013

6.4

2009

5.0

2005

4.6

1999

7.9

1990

6.8