| S&P 500 | UDR | | 2019 - 50,006 2020 - 42,453 2021 - 37,185 -26% | 2019 - 197,350 2020 - 183,979 2021 - 199,094 Fluctuating | 2019 - 33,488 2020 - 35,276 2021 - 41,864 25% | 2019 - 8,347,518 2020 - 8,561,996 2021 - 9,148,409 10% | 2019 - No data 2020 - No data 2021 - No data No data | 2019 - No data 2020 - No data 2021 - No data No data |