datum	gem. vraagprijs	gem. verkoopprijs
Sep 2008	329.128	258.314
Okt 2008	330.410	259.137
Nov 2008	332.488	245.292
Dec 2008	331.408	252.145
Jan 2009	330.102	255.906
Feb 2009	328.726	247.830
Mrt 2009	327.609	240.130
Apr 2009	328.435	238.277
Mei 2009	330.137	236.447
Jun 2009	331.451	231.684
Jul 2009	331.872	235.361
Aug 2009	331.303	231.295
Sep 2009	331.083	233.504
Okt 2009	330.871	238.827
Nov 2009	330.415	233.663
Dec 2009	330.406	239.605
Jan 2010	331.088	240.650
Feb 2010	328.219	233.902
Mrt 2010	327.082	236.230
Apr 2010	326.058	241.859
Mei 2010	326.218	236.799
Jun 2010	326.070	241.017
Jul 2010	325.954	245.245
Aug 2010	325.462	242.259
Sep 2010	324.513	245.706
Okt 2010	323.903	241.580
Nov 2010	321.992	234.732
Dec 2010	321.970	234.739
Jan 2011	322.405	240.983
Feb 2011	322.653	234.444
Mrt 2011	320.004	244.661
Apr 2011	319.445	243.245
Mei 2011	319.664	240.276
Jun 2011	320.731	241.662
Jul 2011	319.697	248.424
Aug 2011	318.300	241.390
Sep 2011	316.970	246.538
Okt 2011	316.282	237.499
Nov 2011	315.250	232.640
Dec 2011	314.283	230.582
Jan 2012	313.219	241.473
Feb 2012	310.997	237.464
Mrt 2012	309.414	230.341
Apr 2012	309.236	231.130
Mei 2012	309.181	228.010
Jun 2012	309.501	240.443
Jul 2012	309.502	216.721
Aug 2012	308.472	214.075
Sep 2012	307.686	216.849
Okt 2012	307.752	214.546
Nov 2012	306.296	220.465
Dec 2012	306.706	221.887
Jan 2013	306.113	206.583
Feb 2013	304.144	210.384
Mrt 2013	302.440	220.430
Apr 2013	300.988	214.969
Mei 2013	300.921	211.869
Jun 2013	301.129	206.114
Jul 2013	301.392