pre_text: The performance rights sub-plan has also been used to compensate new hires for foregone equity, and ensure that key employees are retained to protect and deliver on the Group’s strategic direction. It has been offered to: Executives of newly acquired businesses in order to retain intellectual property during transition periods; or Attract new executives, generally from overseas; or Middle management or executives deemed to be top talent who had either no or relatively small grants scheduled to vest over the ensuing two years. Sign-on and retention rights generally do not have performance measures attached to them due to the objective of retaining key talent and vest subject to the executive remaining employed by the Group, generally for two or more years. The performance rights sub-plan has also been used to compensate employees of the Group. Participants are required to meet a service condition and other performance measures to gain access to the performance rights. The following table summarises movements in outstanding rights:
table: 2019 2018
table: NO. OF RIGHTS NO. OF RIGHTS
table: Outstanding at start of period 10,692,594 6,737,076
table: Granted during the period 4,465,617 5,691,731
table: Vested during the period (182,601) (586,663)
table: Lapsed during the period (1,497,852) (1,149,550)
table: Outstanding at end of period 13,477,758 10,692,594
question: Analyse this data from a financial earnings document. What is the average number of rights 'outstanding at end of period' for 2018 and 2019?