1994

6.8

2005

7.6

2005

8.1

2015

8.7

2014

7.4

2015

6.9

1993

7.9

2019

8.5

2023

7.5

2007

8.0

2015

7.8

2007

7.7

1997

8.3

1969

7.3

2012

7.6

2016

7.0

2015

7.0

1966

7.6

2014

7.5

2002

8.3