Cycle 0: 1 December 2012 - 14 November 2013 - Proposal deadline: 17 September 2013

Cycle 1: 15 November 2013 - 14 May 2014 - Proposal deadline: 6 September 2013

Cycle 2: 15 May 2014 - 14 November 2014 -  Proposal deadline: 7 March 2014

Cycle 3: 15 November 2014 - 14 May 2015 - Proposal deadline: 10 September 2014

Cycle 4: 15 May 2015 - 14 November 2015 - Proposal deadline: 11 March 2015

Cycle 5: 15 November 2015 - 14 May 2016 - Proposal deadline: 9 September 2015

Cycle 6: 15 May 2016 - 14 November 2016 - Proposal deadline: 9 March 2016

Cycle 7: 15 November 2016 - 14 May 2017 - Proposal deadline: 14 September 2016

Cycle 8: 15 May 2017 - 14 November 2017 - Proposal deadline: 8 March 2017

Cycle 9: 15 November 2017 - 14 May 2018 - Proposal deadline: 13 September 2017

Cycle 10: 15 May 2018 - 14 November 2018 - Proposal deadline: 7 March 2018, 12 UT

Cycle 11: 15 November 2018 - 31 May 2019 - Proposal deadline: 6 September 2018, 12 UT

Cycle 12: 1 June 2019 - 30 November 2019 - Proposal deadline: 6 March 2019, 12 UT

Cycle 13: 1 December 2019 - 31 May 2020 - Proposal deadline: 11 September 2019, 12 UT

Cycle 14: 1 June 2020 - 30 November 2020 - Proposal deadline: 4 March 2020, 12 UT

Cycle 15: 1 December 2020 - 31 May 2021 - Proposal deadline: 9 September 2020, 12 UT

Cycle 16: 1 June 2021 - 30 November 2021 - Proposal deadline: 3 March 2021, 12 UT

Cycle 17: 1 December 2021 - 31 May 2022 - Proposal deadline:  8 September 2020, 12 UT

Cycle 18: 1 June 2022 - 30 November 2022 - Proposal deadline: 9 March 2022, 12 UT

Cycle 19: 1 December 2022 - 31 May 2023 - No formal proposal call: One-time skipping of proposal call

Cycle 20: 1 June 2023 - 31 May 2024 - Proposal deadline: 8 March 2023, 12 UT