1975

4.5

7.8

5.0

2014

6.6

1990

4.7

2000

5.9

1972

7.1

2004

7.1

2003

7.3

2015

6.4

2009

8.5

2021

6.2

2016

4.8

2017

5.3

2016

6.3

2016

5.1

2016

5.4

2007

7.2