1990

5.0

2019

3.7

1969

6.7

2005

7.7

2004

6.6

2021

6.3

1999

6.5

2014

6.7

2002

7.0

2006

6.6

2005

6.3

1993

7.1

2000

6.5

2002

5.4

2008

7.2

2004

6.8

1997

6.6

1993

7.2

2015

7.8

1996

7.3