data
| Date | L日 | L晚 | L夜 |
|---|---|---|---|
| dB | dB | dB | |
| 2021-Q4 | 74.7 | 70.1 | 67.1 |
| 2021-Q3 | 73.3 | 68.9 | 67.1 |
| 2021-Q2 | 73.5 | 68.6 | 66.6 |
| 2021-Q1 | 73.4 | 68.6 | 67.7 |
| 2020-Q4 | 72.9 | 67.8 | 65.7 |
| 2020-Q3 | 71.7 | 67.6 | 65.0 |
| 2020-Q2 | 73.4 | 70.3 | 67.5 |
| 2020-Q1 | 74.5 | 71.8 | 67.6 |
| 2019-Q4 | 72.3 | 69.5 | 66.0 |
| 2019-Q3 | 72.4 | 67.8 | 66.1 |
| 2019-Q2 | 73.2 | 68.4 | 67.0 |
| 2019-Q1 | 73.3 | 78.7 | 66.6 |
| 2018-Q4 | 73.3 | 68.2 | 65.2 |
| 2018-Q3 | 73.0 | 67.5 | 67.0 |
| 2018-Q2 | 77.5 | 73.0 | 70.7 |
| 2018-Q1 | 75.4 | 69.8 | 68.9 |
| 2017-Q4 | 69.8 | 64.8 | 61.9 |
| 2017-Q3 | 74.3 | 68.7 | 67.9 |
| 2017-Q2 | 71.0 | 66.6 | 63.3 |
| 2017-Q1 | 78.3 | 74.0 | 71.5 |
| 2016-Q4 | 70.6 | 65.4 | 65.4 |
| 2016-Q3 | 71.8 | 66.4 | 67.2 |
| 2016-Q2 | 69.5 | 64.4 | 63.8 |
| 2016-Q1 | 70.1 | 64.5 | 63.7 |
| 2015-Q4 | 69.0 | 64.2 | 64.1 |
| 2015-Q3 | 71.6 | 67.3 | 63.1 |
| 2015-Q2 | 70.9 | 71.6 | 65.0 |
| 2015-Q1 | 75.5 | 70.6 | 68.2 |
| 2014-Q4 | 72.6 | 69.7 | 59.5 |
| 2014-Q3 | 72 | 69 | 70 |
| 2014-Q2 | 69 | 65 | 62 |
| 2014-Q1 | 71 | 68 | 58 |
| 2013-Q4 | 72.1 | 69.4 | 65.7 |
| 2013-Q3 | 72.3 | 65.2 | 67.6 |
| 2013-Q2 | 70.9 | 66.2 | 66.0 |
| 2013-Q1 | 72.8 | 67.0 | 67.6 |