5%
4%
3%
2%
1%
0%
2003
2004
2005
2006
2007
2008
2009
2010
2011
7%
2013
2014
2015
2016
2017
2018
2019
2012
4.22%
4.22%
4.28%
5.03%
4.85%
4.81%
7.88%
6.65%
6.46%
6.56%
5.46%
5.09%
4.23%
4.36%
4.97%
4.36%
5.04%
Global
Financial
Crisis
European Sovereign Debt Crisis
Global Growth Concerns / BREXIT
Yield
6%
8%
4.55%
4.56%
5.06%
5.72%
5.79%
6.67%
6.16%
4.22%
3.90%
3.18%
3.08%
3.10%
3.29%
3.19%
3.26%
3.86%
3.36%
Thornburg Investment Income Builder Fund
Bloomberg Barclays U.S. Corporate Bond Index