Type	Name	Date
Underwriting agreement	Underwriting Agreement	10/29/2018
Underwriting agreement	Underwriting Agreement	09/07/2017
Underwriting agreement	Underwriting Agreement	05/05/2017
Underwriting agreement	Underwriting Agreement	07/29/2016
Underwriting agreement	Underwriting Agreement	02/22/2016
Underwriting agreement	Underwriting Agreement	08/06/2015
Underwriting agreement	Underwriting Agreement	02/27/2015
Underwriting agreement	Underwriting Agreement	05/22/2014
Underwriting agreement	Underwriting Agreement	05/23/2013
Underwriting agreement	Underwriting Agreement	02/09/2012
Underwriting agreement	Underwriting Agreement	02/01/2011
Underwriting agreement	Underwriting Agreement	07/29/2010